Hoisting-machine.



E. WHITNEY.

HOISTING MACHINE. APPLICATION Hutu Nov. 22, w13,

l 1,114,832. Patented 0cn.27,1914.

//lllllllllll.\\\\\\\\\\\\\\ EGBEIEVI VHITNEK OF MAIIA., .NE

.HOISTING-MAC'I'IINE.

1,1 Messie.

Speciteation of Letters Patent. Application fil-:d Novembcr22, 1913.

atented Oct. 27, 1914. se1-ia1No.s02./118.

To ZZ `al1/1,0111, '15 'may concern lle it known that li. l'lcnmrr lVIirrNtr, a citizen ot' the lnitcrl States. residinf! in the city ot Omaha, of Nebraska, have invented certain new and county ol' Douglas. and Stale useful improvements in lloistingf-huhines. l

and have described the same in the t'ollowing specification, illustrated by the accoltipanyinzg drawings. 1

My invention relates to that class of hoistingr macl'iines` which are commonly used iu pairs Isuspemled by cables at-the side. of a building in process ot' construction 'For the purpose ot' raising. lowering' and supportilig a. platform for the aceonmiodation o'l bricklayers and other worlnuen. A. typical machine of this class is the subject ot' Letters l-atent ot' the United States No. M8370. which were issued to me July 154, inun'mfmnents in scall'olds.

The principal objects otthe invention are these. viv.: to simplify the constructiom and reduce lthe number ot parts and the costi ot' manufacture, ot machines ot' this class: to malte the machines cmnpact. and to protect', their clutch mechanisms from snow, ice. mortar, etc.. and lrom personal interference: to avoid unnecessary friction: to hohl the cables approximately straight constantly. and thereby avoid the work thatl would be involved in bendingq them around drums: to apply the operative power to the. cables with maximum direct'ncss. and thereby to raise the given loads with minimum el'loits:'to facilitate the operative en alejeuunt ol' the machines with the cables und also with the plat/forms: and in general to increase they eil'iciency of machines ole this class., 'l`o accomplish tl ese objects l incorporate in my improved hoisting machine a pair ole automatic. clutches adapted to engage a suspending` 'able, means for holding' the clutches constantly in vertical alim-ment and Vl'or carryiner a load suspended therelrom. means for working vthe clutches rerutitiously town rd and from each other in such alinement upon the cable, and means for releasing the clutches severally.

Tn said drawings, illustrating the best manner in which I have contemplated applyingthe principles of thefinventipn Vlig'- ure l is a side elevation ot' a hoistinginachine which is constructed of iron and steel in accordance with these. principles. and is applied to a suspending?r wireleable. Fig. 2

1011. tot? 's a vertical axial section of a portion of clutch. Fig. 3 is a bori'fzontal lsection on the, section line a'-.r ol'I Figi, L. Fig. `l isa like section of the clutch casing on the section line j/f-y/ of Fig. 2. Fig. 5 is a perspective view of one of the clutch jaws. Fig. t is a persptattive view of a portion ot' a pair ot' the clutch jaws. Fig. T is a detail.

ln this illnstrfuecl and idustrative specimen ol` my .invention` the two alining clutches are mounted respectively in the. clutch boxes t and Q. Iach of these boxes las a vertical peripheral split tubular Wall, formed iu duplicate wald-sections 3 and 4, marginally contactingr with each other, a vCap 5 fitted over the top ot' tbe wall` and anJ inverted cap (l littcd to the bottom of the same. These caps hold the contacting wall sections rigidly together. and have each a hole 7 through the middle `for the accommodation oi the steel wire cable 8, which is suspended from above. By these caps and their terminal pert'orations 9. the upper clutch box bas a rigid engagement, and the lower clutch box a sliding;r engagement, With tbe vertical side rodsl lt). occupying those perForations. rlhe lower clutch box is movable vertically a short. distance toward and l'rom the upper clutch box on and between these rods by the split hand lever 11, which works like a pump handle. on a pivot 12 proiectiue; trom that; bo.\' and is connectedA by the lnlt l with the slop bracket 14 fixed on one ol" these rods. rlhe clutch in each of these boxes comprisesl two duplicate Vertically disposed semi-tubular jaws t5, mounted on the springs It', and registeringr with each other |`ace to lace. being held in that position by the tran-'veise guiding arms l?, wei-kine in the transverse slots 1S as the jaws approach and recede. :l'rom eaeh other. Beine so held, they are movable vertically in unison between the anti-friction rollers 419, ou the rivets 2O extendingr horizontally through the box. 'lhese jaws have the internal riblilte teeth 21 arranged in relatively staggered positions in the two jaws respectively, to bite the cable; and external wedgeshaped projections 22 on the back of each jaw. to engage the rollers t9 and thereby to produce and to release the bite as the, clutch 4 rises and Falls in the box. lhe ltey 24, iS a. removable pin hmgritzut'linally slidable by hand in the vertical hole through the, top

ll) i the lower clutch of the lever, thereby releasing and raising .upper clutch from mended,

ci' eitlier cap 5 alternative-ly, and adapted by' downward pressure to depress and thereby release described clutches.

cable 8 connects the side rods l0 at the bot-- torn, and is'intcnded to support die platiiorm. i liilien undisturbed by manipulation, both l clutches of the loaded machine grip thc snspending cable; the lower clutch being octuated by toe clutcb` 'the wedgingjaivs 'upward tween vthe rollers v19; and being additionally cated by tbe down- Ward pull oi the communicated to tlioso side rods l and the opper lclutch forcing' the jaws together. To raise the load, a Workman first lifts the free end and together tbe 'opper clutel:

`\orni or other load, rollers through tbe box, and

box, and-then forces down the lever, thereby bringing the lower clutch into action and releasing and lifting "elle ich tbe load susly thus raising and. lowering the lever repetitionsly, like a pump handle, lic causes tliemachine 'to climb the cable with en inch Worm movement, so to speak, and 'raises the platform to any desired level Step by step, 'lo lower` tlie load, both clutches gripping as above lescribed, tl'ie operator. iirst releases the upper clutch with `tile key 26%, tllen lots down tbe upper clutch iig springs, 'which force l for holding libc clutches in vertical eline-` inent and carrying' a. suspended load,

means for nim-fing' the clutches toward and from ea'li other in such alinement, and

tlie clutches severally; .i li lievi tivo co-acting, springinounteo., vertical "wedge jaws between antiriction rollers, being' adapted to grip automatically a suspending cable and to be released from that cable.

si hoisting?,` machine of the specified class, `comprising;1 tivo clutches adapted to grip a cable automatically, wo clutch boxes holdingy the clutches respectively, two vertical rods lowing a rigid` connection with one of die clutch boxes and a sliding, engagement other, and holding the clutch boxes and contained clutches constantly in vertical alinement at a changeable distance apart, n cross connection between the rods for the support of the load, means for sliding one of the clutch boxes toward and from the other on the vertical rods, and means for releasing` the clutches severally.

n releasing* adapted to ri-ip a suspending' cable, means bei; end ills dependent load raising` #be i for holding che clutches constantly in verlever, tlien with 'tbe saine t] deferred l tical Flinement and for carrying the load izo tbe .lower clutch iii: 1` I "ided, therefrom, means for releasing clntcli entonni'ically,gi ,s cel.. E folies severally., and c link sind lever lenses 'toe lower clutch and tlieu lmvers the conlfiection bein een tbe clutches for moving lower clutch box iu lic saine nimo ilierctlieni toward ond from each other. by placing the machine in poslure loi raisl hoisting 'llechin 0f the Specified i; er. lowering' again in tbe same g class, ccniprising 'tivo automatic clutches Constructed and operatine,` as df adapted to grip e suspending cable, sepa-` tlie niacline acconngilislies the abo f L irate bones inclosing tbe clutches respecoli of my invention in all ifs branches, ineens for holding; the clutch boxes l. claiinz-M I vertical eliueinent at varying distances l. A bois o machine oi specified ap and for carrying' a. load, means for elses, compri ingytivo, eulomatiy-clutches l i-soiijJrcoating the clutch iOOXGSi find il kel" adapted to grip alternatively a susiiending slidable in e liole in eacli box for releasing cable, means for raising and lowering e l clnilfclles independently on the cable, and a i suspended frame, upheld by the clutches! a i i alter ativelv and. provided Witlx. means for lioloing botli clntclies in verti il alineniont.

2. A. noisting machine ci. tn speci l. ma

class, connorisingq a'xitoniaic adapted to engage a soepen o ror bol, tbe tenes consta 'the contained clutch.

In testimony whereof l subscribe my neme hereto in tlie presence of two Wit- EGBERT WHITNEY. 

